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Investment Securities (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Loan maturity distribution by type and related interest rate    
Available-for-sale Securities, Contractual Maturities, Less than one year, Value $ 2,072us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue $ 2,082us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Available-for-sale Securities, Contractual Maturities, Less than one year, Yield 0.68%sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureNextTwelveMonth 0.68%sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureNextTwelveMonth
Available-for-sale Securities, Contractual Maturities, One to Five Years, Value 1,001us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue 1,387us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Available-for-sale Securities, Contractual Maturities, One to Five Years, Yield 2.12%sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureAfterOneAndThroughFiveYear 2.14%sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureAfterOneAndThroughFiveYear
Available-for-sale Securities, Contractual Maturities, Five to Ten Years, Value 8,317us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue 10,583us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
Available-for-sale Securities, Contractual Maturities, Five to Ten Years, Yield 2.92%sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureAfterFiveAndThroughTenYears 2.91%sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureAfterFiveAndThroughTenYears
Available-for-sale Securities, Contractual Maturities, Over Ten Years, Value 37,136us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue 40,972us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
Available-for-sale Securities, Contractual Maturities, Over Ten Years, Yield 2.50%sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureAfterTenYears 2.54%sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureAfterTenYears
Investment securities available for sale, Value 48,526us-gaap_AvailableForSaleSecurities 55,024us-gaap_AvailableForSaleSecurities
Available-for-sale Securities, Contractual Securities, Yield Total 2.48%sfst_ContractualMaturitiesYieldOnDebtSecurities 2.54%sfst_ContractualMaturitiesYieldOnDebtSecurities
US Government agencies [Member]    
Loan maturity distribution by type and related interest rate    
Available-for-sale Securities, Contractual Maturities, Less than one year, Value      
Available-for-sale Securities, Contractual Maturities, Less than one year, Yield      
Available-for-sale Securities, Contractual Maturities, One to Five Years, Value 1,001us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
988us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
Available-for-sale Securities, Contractual Maturities, One to Five Years, Yield 2.12%sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureAfterOneAndThroughFiveYear
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
2.12%sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureAfterOneAndThroughFiveYear
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
Available-for-sale Securities, Contractual Maturities, Five to Ten Years, Value      
Available-for-sale Securities, Contractual Maturities, Five to Ten Years, Yield      
Available-for-sale Securities, Contractual Maturities, Over Ten Years, Value 7,700us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
7,569us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
Available-for-sale Securities, Contractual Maturities, Over Ten Years, Yield 2.43%sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureAfterTenYears
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
2.43%sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureAfterTenYears
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
Investment securities available for sale, Value 8,701us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
8,557us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
Available-for-sale Securities, Contractual Securities, Yield Total 2.39%sfst_ContractualMaturitiesYieldOnDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
2.39%sfst_ContractualMaturitiesYieldOnDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
SBA securities [Member]    
Loan maturity distribution by type and related interest rate    
Available-for-sale Securities, Contractual Maturities, Less than one year, Value      
Available-for-sale Securities, Contractual Maturities, Less than one year, Yield      
Available-for-sale Securities, Contractual Maturities, One to Five Years, Value      
Available-for-sale Securities, Contractual Maturities, One to Five Years, Yield      
Available-for-sale Securities, Contractual Maturities, Five to Ten Years, Value      
Available-for-sale Securities, Contractual Maturities, Five to Ten Years, Yield      
Available-for-sale Securities, Contractual Maturities, Over Ten Years, Value 5,207us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= sfst_SbaSecuritiesMember
5,154us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= sfst_SbaSecuritiesMember
Available-for-sale Securities, Contractual Maturities, Over Ten Years, Yield 1.86%sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureAfterTenYears
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= sfst_SbaSecuritiesMember
1.88%sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureAfterTenYears
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= sfst_SbaSecuritiesMember
Investment securities available for sale, Value 5,207us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= sfst_SbaSecuritiesMember
5,154us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= sfst_SbaSecuritiesMember
Available-for-sale Securities, Contractual Securities, Yield Total 1.86%sfst_ContractualMaturitiesYieldOnDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= sfst_SbaSecuritiesMember
1.88%sfst_ContractualMaturitiesYieldOnDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= sfst_SbaSecuritiesMember
States and Political Subdivisions [Member]    
Loan maturity distribution by type and related interest rate    
Available-for-sale Securities, Contractual Maturities, Less than one year, Value 2,072us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
2,082us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available-for-sale Securities, Contractual Maturities, Less than one year, Yield 0.68%sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureNextTwelveMonth
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
0.68%sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureNextTwelveMonth
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available-for-sale Securities, Contractual Maturities, One to Five Years, Value    399us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available-for-sale Securities, Contractual Maturities, One to Five Years, Yield    3.14%sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureAfterOneAndThroughFiveYear
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available-for-sale Securities, Contractual Maturities, Five to Ten Years, Value 7,068us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
8,465us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available-for-sale Securities, Contractual Maturities, Five to Ten Years, Yield 3.13%sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureAfterFiveAndThroughTenYears
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
3.23%sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureAfterFiveAndThroughTenYears
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available-for-sale Securities, Contractual Maturities, Over Ten Years, Value 5,144us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
5,854us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available-for-sale Securities, Contractual Maturities, Over Ten Years, Yield 2.93%sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureAfterTenYears
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
3.00%sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureAfterTenYears
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Investment securities available for sale, Value 14,284us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
16,800us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available-for-sale Securities, Contractual Securities, Yield Total 2.69%sfst_ContractualMaturitiesYieldOnDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
2.82%sfst_ContractualMaturitiesYieldOnDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Mortgage Backed Securities [Member]    
Loan maturity distribution by type and related interest rate    
Available-for-sale Securities, Contractual Maturities, Less than one year, Value      
Available-for-sale Securities, Contractual Maturities, Less than one year, Yield      
Available-for-sale Securities, Contractual Maturities, One to Five Years, Value      
Available-for-sale Securities, Contractual Maturities, One to Five Years, Yield      
Available-for-sale Securities, Contractual Maturities, Five to Ten Years, Value 1,249us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
2,118us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Available-for-sale Securities, Contractual Maturities, Five to Ten Years, Yield 1.75%sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureAfterFiveAndThroughTenYears
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
1.66%sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureAfterFiveAndThroughTenYears
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Available-for-sale Securities, Contractual Maturities, Over Ten Years, Value 19,085us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
22,395us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Available-for-sale Securities, Contractual Maturities, Over Ten Years, Yield 2.59%sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureAfterTenYears
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
2.62%sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureAfterTenYears
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Investment securities available for sale, Value $ 20,334us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
$ 24,513us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Available-for-sale Securities, Contractual Securities, Yield Total 2.54%sfst_ContractualMaturitiesYieldOnDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
2.54%sfst_ContractualMaturitiesYieldOnDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember